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THURSDAY, OCTOBER 7

"THE VAMPIRE DIARIES" - (8:00-9:00 p.m. ET)

"Kill Or Be Killed" (CONTENT RATING TBD) (HDTV)

MASON'S PAST IS REVEALED - Tyler (Michael Trevino) learns more about the Lockwood family curse from Mason (guest star Taylor Kinney). Stefan (Paul Wesley) and Damon (Ian Somerhalder) argue over how to handle Mason. Elena (Nina Dobrev) tries to keep Jeremy (Steven R. McQueen) from becoming more involved with the Lockwood mystery, but Jeremy makes an effort to hang out with Tyler. Mason gives Sheriff Lockwood (Marguerite MacIntyre) some startling information, leading to a night of violence, confession and heartbreak. Candice Accola also stars. Jeff Woolnough directed the episode written by Mike Daniels (#205).